PLEDGE (not PLADGE) immediately springs to mind as a well known Folkestone baptist family and checking
http://www.familysearch.org confirms the three children of Thomas and Susanna were baptised baptists. There is a little hidden baptist graveyard in Folkestone, I wonder if he was buried there
http://www.kenthistoryforum.co.uk/index.php?topic=10974.0The heritage room at Folkestone library certainly have a plan of the tombstones there at one time, they may well have burial transcripts too so I suggest trying there before looking elsewhere for his burial
http://www.kent.gov.uk/KCC.Libraries.Web.Sites.Public/LibraryDetails.aspx?aid=0&lid=32It looks to me as though Susanna remarried Richard COLLIER in Folkestone 1835
http://www.familysearch.org1841 Seagate Street, Folkestone
Richard COLLIER 45 draper not born in Kent
Susanna 43 b.Kent
Richard 3 b.Kent
Mary 2 b.Kent
William EDWARDS 21 shopman b.Kent
/
Susanna PILCHER 21 shopwoman b.Kent
Margaret HOGBEN 20 female servant b.Kent
John CRAMP 40 dissenting preacher b.Kent
Ann SERGENT 60 not born in Kent
HO107/477 book 27 folio 39 page 30
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There is a will or administration etc. for a Thomas EDWARDS of Folkestone 1825 which may or may not be relevant
http://www.kentarchaeology.ac/ekwills_a/series/ekp_p2/ekp_p2n_dr.htmIncidentally, the baptism registers for the three EDWARDS children give the maternal grandmother's name as Ann PLEDGE.
Rich. COLLIER of Folkestone, bachelor to marry Sus. EDWARDS of Folkestone, widow at Folkestone. Marriage lic. granted 18 Feb 1835.
Look forward to hearing how you get on.
Casalguidi